title: CT recognition of optic nerve sheath meningioma: abnormal sheath visualization.
abstract: Optic nerve sheath meningiomas and optic nerve gliomas can be difficult to differentiate by computed tomography (CT). Three patients with optic nerve sheath meningiomas were studied with a CT/T 8800 scanner with 1.5-mm-thick axial sections and intravenous contrast material. In each case, an abnormal optic nerve sheath was identified by CT. A soft-tissue mass arose from one side of the sheath in one patient, and the entire sheath was enlarged in two patients. This provides a basis for distinguishing optic nerve sheath meningioma from optic nerve glioma.
mesh_terms: D003287:Contrast Media; D003937:Diagnosis, Differential; D005910:Glioma / Q000000981:diagnostic imaging; D006801:Humans; D008577:Meningeal Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D008579:Meningioma / Q000000981:diagnostic imaging*; D009186:Myelin Sheath / Q000000981:diagnostic imaging* / Q000473:pathology; D009900:Optic Nerve; D014057:Tomography, X-Ray Computed
chemical_list: D003287:Contrast Media